Lens assembly, lens moving device and assembling method

ABSTRACT

A lens assembly in a digital still camera has a lens housing. First and second movable lenses/lens groups are contained in the lens housing, and supported in respectively first and second lens holders. A guide rod guides movement of the first and second lenses/lens groups in an optical axis direction with the lens holders. A shutter unit is disposed between the lens holders. A shutter actuator drives the shutter unit. A containing chamber in the lens housing contains the shutter actuator. A first motor is disposed between the guide rod and an inner surface of the lens housing and near to a first surface of the shutter unit, and moves the first lens holder. A second motor is disposed between the guide rod and the containing chamber and near to a second surface of the shutter unit, and moves the second lens holder.

This is a divisional of application Ser. No. 11/545,631 filed Oct. 11,2006. The entire disclosure of the prior application(s), applicationSer. No. 11/545,631 is considered part of the disclosure of theaccompanying divisional application and is hereby incorporated byreference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a lens assembly, lens moving device andassembling method. More particularly, the present invention relates to alens assembly, lens moving device and assembling method, in which movingmechanisms for lenses/lens groups can be suitably arranged in aneconomized space.

2. Description Related to the Prior Art

A digital still camera is an optical instrument in which an image pickupelement such as a CCD photographs an object image. An optical system ina lens assembly of the digital still camera includes movable lenses/lensgroups. Information of an in-focus position is derived by evaluating animage signal obtained by the image pickup element. The lenses/lensgroups are moved according to the in-focus position to focus the opticalsystem, which is an AF (auto focus) device. U.S.P. Pub. No. 2003/107667(corresponding to JP-A 2003-149528) discloses the digital still camerahaving the AF device. The digital still camera has a lens movingmechanism, which includes a lens holder and guide rods. The lens holderholds each one of the lenses/lens groups. The guide rods keep the lensholder movable in an optical axis direction. Also, motors are used inthe digital still camera. For the AF operation, one of the motors asprime mover finely moves the lens holder in the optical axis directionby conversion of rotation to linear movement for the lens holder.

A widely available type of the digital still camera has a zoomingmechanism with which a magnification is changeable by optical zooming. Aplurality of the lens moving mechanisms are incorporated in the digitalstill camera and arranged in the optical axis direction for zooming. Afirst one of the lens moving mechanisms disposed on the objective sidemoves an associated one of the lenses/lens groups, for changing thezooming magnification. A second lens moving mechanism disposed on thefocal plane side moves one associated lens/lens group, for adjusting thefocus.

However, adjustment of the focusing and zooming by use of a plurality ofthe lens moving mechanisms enlarges the size of the lens assembly due todifficult arrangement of the motors. A body of the digital still camerashould be small in view of a compact construction, but cannot be madesmall in a sufficient manner for intention. It is conceivable to disposethe motors to direct output shafts of the motors toward one another, soas to cope with the shortcoming. However, wiring for each of the motorsis required to connect with a control device in the digital stillcamera, by use of such a line as a flexible wiring board. A problemarises in a complicated structure and a large size of the flexiblewiring board.

The lens assembly includes a housing. A positioning hole is formed forpositioning the guide rods. There is a difficulty in known assembly ofthe lens assembly. Recognition of the positioning hole before insertingthe guide rods is not very easy with human eyes, to make it considerablydifficult to assemble the lens assembly. Also, the guide rods may strikethe inside of the lens housing or edges of the positioning hole duringthe insertion, to cause scratches or damages on the lens housing due tothe use of the guide rods.

An improvement is disclosed in JP-A 8-248283. The lens assembly isprovided with an opening, used in the course of assembly of the lensassembly for visually recognizing positions of the guide rods and thepositioning hole. Also, an insertion hole for the guide rods is formedwith a conical surface in a funnel form, to facilitate the insertion ofthe guide rods in the lens housing.

However, the assembly of the lens assembly according to JP-A 8-248283requires observation of the inside of the lens housing through theopening to insert the guide rods in the positioning hole by checkingpositions of the guide rods and the positioning hole. Accordingly, theoperation of the assembly cannot be efficient due to the manualoperation, as the assembly of the lens assembly is difficult toautomate.

Also, JP-A 10-254022 discloses an aperture stop mechanism, whichincludes two aperture stop blades, driven electrically to slide in adirection crosswise to the optical axis direction, for adjusting anaperture stop. A shutter opening is formed through a base plate of theaperture stop mechanism. The aperture stop blades are disposed on thebase plate in a slidable manner. A drive lever for the aperture stopblades converts rotation of the motors into linear movement, which istransmitted to the aperture stop blades to shift the aperture stopblades in directions opposite to one another. Aperture recesses areformed in the aperture stop blades for defining an aperture at theshutter opening, to vary an aperture stop diameter according to anamount of overlapping of the aperture recesses.

The aperture stop mechanism of JP-A 10-254022 has a simple structure andmay be produced at a low cost. The aperture stop mechanism is usablealso as a shutter device. With the aperture stop mechanism, it isconceivable to combine path changing optics for changing an optical pathwith a bend. JP-A 9-033782 discloses an example of the path changingoptics. Also, JP-A 2005-084654 discloses lens shift as a basis of thepath changing optics, including two lenses/lens groups disposed beforeand after the shutter device and the aperture stop mechanism, and theguide rods for guiding the lenses/lens groups. However, a problem arisesin incorporating the aperture stop mechanism in the path changing opticsof the known technique. A space of the aperture stop blades required formoving cannot be obtained sufficiently because the guide rods mustextend within a region of movement of the aperture stop blades. If theaperture stop mechanism is disposed to cause the aperture stop blades tomove in a direction away from the guide rods, a thickness of the imagepickup optical system will be too great. A size of the lens assemblycannot be small sufficiently.

SUMMARY OF THE INVENTION

In view of the foregoing problems, an object of the present invention isto provide a lens assembly, lens moving device and assembling method, inwhich moving mechanisms for lenses/lens groups can be suitably arrangedin an economized space.

Another object of the present invention is to provide a lens assembly,lens moving device and assembling method, in which moving mechanisms forlenses/lens groups can be assembled efficiently in a facilitated manner.

Still another object of the present invention is to provide a lensassembly, lens moving device and assembling method, in which a shuttermechanism and lens moving mechanisms can be suitably arranged in aneconomized space.

In order to achieve the above and other objects and advantages of thisinvention, a lens assembly has a lens housing, first and second lenses,being movable, contained in the lens housing, and supported inrespectively first and second lens holders, and a guide rod for guidingmovement of the first and second lenses in an optical axis directionwith the first and second lens holders. The lens assembly includes ashutter unit disposed between the first and second lens holders. Ashutter actuator drives the shutter unit. A containing chamber in thelens housing contains the shutter actuator. A first actuator is disposedbetween the guide rod and an inner surface of the lens housing and nearto a first surface of the shutter unit, for moving the first lensholder. A second actuator is disposed between the guide rod and thecontaining chamber and near to a second surface of the shutter unit, formoving the second lens holder.

Furthermore, a guide recess is formed in each of the first and secondlens holders, for receiving insertion of the guide rod in a slidablemanner.

The lens housing includes a first inner surface, disposed to extendsubstantially in parallel with the optical axis direction, and havingone portion where the containing chamber is located. A second innersurface is disposed to extend substantially in parallel with the opticalaxis direction, and crosswise to the first inner surface. Through holesis formed through the inner surface, for passing terminals of the firstand second actuators and a terminal of the shutter actuator, to protrudeexternally.

Furthermore, a detector is disposed between the guide rod and the secondinner surface, for detecting a position of each of the first and secondlens holders. A through hole is formed through the second inner surface,for passing a contact of the detector to protrude externally.

In one preferred embodiment, the lens housing has a box or barrel shape.

Furthermore, through holes are formed through an inner surface of thelens housing, for passing terminals of the first and second actuatorsand a terminal of the shutter actuator, to protrude externally.

Furthermore, a detector is disposed between the guide rod and the innersurface, for detecting a position of each of the first and second lensholders. A through hole is formed through the inner surface, for passinga contact of the detector to protrude externally.

The first and second actuators are motors.

Also, a lens assembly includes plural movable lens components supportedin respectively lens holders. A guide rod guides movement of the lenscomponents in an optical axis direction with the lens holders. A lenshousing contains the plural lens components and the guide rod. The lenshousing includes a body, having an opening formed to open in a directioncrosswise to the optical axis direction, and passable by the guide rodand the plural lens components assembled thereon. A first supportportion supports the guide rod on the body. A lid closes the opening.

Furthermore, a lens moving mechanism moves the plural lens components.

The lid includes a regulator for limiting movement of the guide rodtoward the opening upon closing the opening by fitting.

Furthermore, there is a shutter unit. A second support portion is formedwith the lens housing, for supporting the shutter unit. The shutter unitis set on the second support portion while assembled with the guide rod.

The first support portion retains two ends of the guide rod.

The guide rod is constituted by at least first and second guide rods,and the first support portion is constituted by at least two firstsupport portions.

The lens housing includes a guide portion for introducing the guide rodfrom the opening to the first support portion.

The guide portion is a guide channel formed to extend toward the firstsupport portion.

The guide channel has a width substantially equal to a diameter of theguide rod.

In a preferred embodiment, the guide channel has a width greater than adiameter of the guide rod.

Furthermore, adhesive agent attaches the guide rod to an inside of theguide channel.

The guide channel has an inclined inner surface inclined to increase achannel width from an inner position toward an outer position.

Also, an assembling method of assembling a lens assembly is provided,the lens assembly including plural movable lens components supported inrespectively lens holders, a guide rod for guiding movement of the lenscomponents in an optical axis direction with the lens holders, and alens housing for containing the plural lens components and the guiderod. In the assembling method, the plural lens components are set on theguide rod. The guide rod and the plural lens components are passedthrough an opening of the lens housing formed to open in a directioncrosswise to the optical axis direction. The guide rod is supported onthe lens housing with a first support portion. The opening is closedwith a lid.

Furthermore, a lens moving device includes a movable lens movable in adirection of an optical axis. A guide rod guides movement of the movablelens on the optical axis. A base panel has a light path openingpositioned on the optical axis. First and second interception blades aredisposed to overlap with one another on the optical axis, movable in anassociated manner in a direction crosswise to the optical axis andbetween first and second positions, for shutting the light path openingwhen in the first position, and for opening the light path opening whenin the second position. A slot is formed in at least the firstinterception blade, for receiving insertion of the guide rod, and forallowing the first interception blade to move.

The slot is formed to extend in a predetermined direction to keep theguide rod slidable relatively, for guiding slide of the interceptionblades in the predetermined direction.

Furthermore, a rail portion is formed with one surface of the basepanel, for keeping the interception blades slidable, the light pathopening being positioned in a middle of the rail portion.

Furthermore, there is a stationary lens. A fastening surface is formedwith an outside of the rail portion, and having the light path opening,for receiving the stationary lens secured thereto.

The movable lens is in each of positions in front of and behind theinterception blades with respect to the optical axis direction. Theguide rod has a length to guide movement of the movable lens.

BRIEF DESCRIPTION OF THE DRAWINGS

The above objects and advantages of the present invention will becomemore apparent from the following detailed description when read inconnection with the accompanying drawings, in which:

FIG. 1 is a perspective view illustrating a digital still camera;

FIG. 2 is a rear perspective view illustrating the digital still camera;

FIG. 3 is an explanatory view in elevation, illustrating an image pickupoptical system;

FIG. 4 is an exploded perspective illustrating a lens housing from whicha lid is removed;

FIG. 5 is an exploded perspective illustrating a state of the lenshousing from which a lens moving mechanism is removed;

FIG. 6 is an exploded perspective illustrating a state of the lenshousing from which motors are removed;

FIG. 7 is an exploded perspective illustrating the lens housing and thephoto interrupters;

FIG. 8 is an exploded perspective illustrating the lens movingmechanism;

FIG. 9 is an explanatory view in elevation, illustrating the inside ofthe lens housing from which the lid is removed;

FIG. 10 is a horizontal section taken on line X-X in FIG. 9;

FIG. 11 is a horizontal section taken on line XI-XI in FIG. 9;

FIG. 12 is a perspective view illustrating the rear of the lensassembly;

FIG. 13 is a horizontal section illustrating another preferred lensassembly with correlated arrangement of motors;

FIG. 14 is an exploded perspective illustrating another preferred lensassembly in which guide rods are kept fixed suitably;

FIG. 15 is an exploded perspective illustrating a lens housing;

FIG. 16 is an exploded perspective illustrating lens holders and variouselements to be contained in the lens housing;

FIG. 17 is a perspective view illustrating the rear of the lid;

FIGS. 18 and 18A are cross sections illustrating a relationship betweena regulator, guide channel, and guide rod;

FIG. 19 is a section, partially broken, illustrating another preferredguide channel;

FIG. 20 is a section, partially broken, illustrating one preferredembodiment of a variant contact surface;

FIG. 21 is a vertical section illustrating an image pickup opticalsystem of another preferred digital still camera;

FIG. 22 is an exploded perspective illustrating a aperture stopadjusting shutter mechanism;

FIG. 23 is a vertical section, partially broken, illustrating theshutter mechanism;

FIG. 24 is a plan illustrating the shutter mechanism in a shut state;

FIG. 25 is a plan illustrating the shutter mechanism in an open state;

FIG. 26 is a plan illustrating the shutter mechanism with a reduced openarea;

FIG. 27 is an exploded perspective illustrating fitting of a fourth lensholder on a fastening surface; and

FIG. 28 is a plan illustrating a position of applying adhesive agent andcut positions for cutting adjusting arms.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) OF THE PRESENTINVENTION

In FIGS. 1 and 2, a digital still camera 10 is illustrated. A camerabody 11 has a front face in which a lens opening 12 for photographingand flash light source 13 are disposed. A power button 14 and a shutterbutton 15 are disposed on an upper face of the camera body 11.

On the rear of the camera body 11 are disposed an LCD display panel 16,a zoom button 17, a cursor button 18, and a mode selection button 19.The mode selection button 19 is operable manually by a user to set aselected one of plural modes, which are a photographing mode to writeimage data of an image to a memory card, a playback mode to play back animage read from the memory card, and a setup mode for determine varioussettings.

The LCD 16 is used for playing back images, and also is an electronicviewfinder for displaying a live image in the photographing mode. Alsothe LCD 16 displays a menu screen region while a setup mode is set. Thecursor button 18 is operated for shifting a cursor on the menu screenregion and for selecting one of items on the menu screen region. Thezoom button 17 is operated to change a zoom magnification.

In FIG. 3, an image pickup optical system 20 of a lens assembly used inthe digital still camera 10 is illustrated. The image pickup opticalsystem 20 includes first, second, third and fourth lens groups G1, G2,G3 and G4. Also, a rectangular prism is associated with the first lensgroup G1 for changing an optical path with a bend.

The first lens group G1 includes a first lens element 25, a rectangularprism 26, and a second lens element 27. The first lens element 25 isdisposed behind the lens opening 12. An entrance surface 26 a of therectangular prism 26 receives object light passed through the first lenselement 25. The rectangular prism 26 has the entrance surface 26 a, areflection surface 26 b, and an exit surface 26 c. The reflectionsurface 26 b changes a path of object light having traveled on anoptical axis Li of the entrance surface 26 a, and directs the objectlight on an optical axis L2 by a change of an angle of 90 degrees. Theexit surface 26 c causes the object light to exit to the outside uponreflection on the reflection surface 26 b. The second lens element 27passes the object light on the optical axis L2 from the rectangularprism 26, and directs the object light toward the second lens/lens groupG2.

A lens carrier 66 with a lens holder holds the second lens/lens groupG2, and varies a magnification of zooming by moving in a direction A orB of FIG. 3. The second lens/lens group G2 may be a single lens elementor a lens group having plural lens elements. The third lens group G3passes object light from the second lens/lens group G2 toward the fourthlens group G4.

Another lens carrier 67 with a lens holder holds the fourth lens groupG4, and adjusts the focusing by finely moving in a direction C or D ofFIG. 3. There is a low-pass filter 22 through which object light exitingfrom the fourth lens group G4 is passed. A CCD image sensor 28 is sodisposed that the object light from the low-pass filter 22 is focused ona focal plane on the sensor surface. The purpose of the low-pass filter22 to prevent moire or change in color.

In FIGS. 4, 5 and 6, a lens assembly or lens mount 29 includes a lenshousing 33, a zoom motor 45 as first actuator, a focusing motor 46 assecond actuator, photo interrupters 55 and 56 as detectors, and a lensmoving mechanism 65 as first and second lens moving mechanisms. The lenshousing 33 includes a body 31 and a front lid 32 for closing an openside of the body 31.

In FIG. 5, the body 31 of the lens housing 33 has a housing chamber 31 aand a containing chamber 31 b. The containing chamber 31 b is in acontaining projecting portion extending from the housing chamber 31 a tothe left in the drawing. The housing chamber 31 a contains the zoommotor 45, the focusing motor 46, the photo interrupters 55 and 56 andthe lens moving mechanism 65. There is a shutter unit 72. A shuttermotor 92 as shutter actuator drives the shutter unit 72, and iscontained in the containing chamber 31 b.

A prism containing chamber 34 is formed in the body 31 of the lenshousing 33 for containing the rectangular prism 26. A lens holder 35 isformed on the body 31 for holding the first lens element 25. Guidechannels 36 and 37 are formed in lateral portions of the prismcontaining chamber 34. Guide rods 70 and 71 have upper ends inserted inthe guide channels 36 and 37.

A CCD frame 38 is disposed low in the body 31 of the lens housing 33 andsupports the low-pass filter 22 and the CCD 28 mounted therein. Guidechannels 39 and 40 are formed in portions of the CCD frame 38, andpositioned to face the guide channels 36 and 37, for insertion of lowerends of the guide rods 70 and 71. Also, rail channels 41 and 42 areformed in the body 31, for positioning the shutter unit 72 inpredetermined positions of the body 31 when the lens moving mechanism 65is contained in the body 31.

An inner surface 31 d as first inner surface and an inner surface 31 eare defined inside the housing chamber 31 a of the body 31 of the lenshousing 33. A bracket 47 is associated with the zoom motor 45, which isa prime mover to move the lens carrier 66 in the optical axis directionL2. A bracket 48 is associated with the focusing motor 46, which is aprime mover to move the lens carrier 67 in the optical axis directionL2. Screws 49 are used to fasten the zooming and focusing motors 45 and46 with the brackets 47 and 48. Holes 31 f and 31 g are formed in theinner surface 31 d of the housing chamber 31 a. The screws 49 arehelically coupled with screw holes 47 a and 47 b by passing through theholes 31 f and 31 g to fasten the bracket 47 on the body 31. Holes 31 hand 31 i are formed in the inner surface 31 e of the housing chamber 31a. The screws 49 are helically coupled with screw holes 48 a and 48 b bypassing through the holes 31 h and 31 i to fasten the bracket 48 on thebody 31. Through holes 51 and 52 are formed in an inner surface 31 j ofthe body 31 as second inner surface. First and second terminals 45 a and46 a of the zooming and focusing motors 45 and 46 are inserted in thethrough holes 51 and 52. A third terminal 92 a extends from the shuttermotor 92 in the shutter unit 72. A through hole 53 receives insertion ofthe third terminal 92 a.

In FIG. 7, the photo interrupters 55 and 56 are secured to the innersurface 31 j of the body 31 of the lens housing 33 fixedly for detectingthe reference positions of the lens carriers 66 and 67. Steps ofassembly are described now. For the photo interrupter 55, contacts 55 a,55 b, 55 c and 55 d of the photo interrupter 55 are inserted in holes 57a, 57 b, 57 c and 57 d, before the photo interrupter 55 is attached tothe body 31 by adhesive agent. For the photo interrupter 56, contacts 56a, 56 b, 56 c and 56 d of the photo interrupter 56 are inserted in holes58 a, 58 b, 58 c and 58 d, before the photo interrupter 56 is attachedto the body 31 by adhesive agent. There is an opening 60, in which aposition adjusting armor lever 93 b of a lens holder 93 is inserted,which will be described later.

The front lid 32 closes a front opening of the body 31 of the lenshousing 33. Screw holes 31 k-31 p are formed in the body 31. Screws 61are set in the screw holes 31 k-31 p to fasten the front lid 32 on thebody 31. Holes 32 a-32 f are formed for receiving insertion of thescrews 61. An upper portion of the front lid 32 has a cutout in arcshape, which becomes fitted on the prism containing chamber 34 when thefront lid 32 is secured to the body 31.

Regulating projections 62 a, 62 b, 62 c and 62 d are formed on upper orlower portions of the front lid 32 and disposed at predeterminedintervals. The regulating projections 62 a and 62 b are inserted in theguide channels 36 and 37 of the body 31 of the lens housing 33, contactupper end faces of the guide rods 70 and 71, and prevent those fromoffsetting. The regulating projections 62 c and 62 d are inserted in theguide channels 39 and 40 of the body 31, contact lower end faces of theguide rods 70 and 71, and prevent those from offsetting. There is anopening 32 g, through which a position adjusting arm or lever 93 a isinserted. A lens holder for the third lens group has the positionadjusting arm or lever 93 a.

In FIG. 8, the lens moving mechanism 65 is illustrated in a perspective.Movement transmitting panels 68 and 69 as movement transmittingmechanism are included in the lens moving mechanism 65 together with thelens carriers 66 and 67, the guide rods 70 and 71 and the shutter unit72. A first lens moving mechanism has the movement transmitting panel 68with the lens carrier 66, the guide rods 70 and 71 on an objective sidefrom the shutter unit 72. A second lens moving mechanism has themovement transmitting panel 69 with the lens carrier 67, the guide rods70 and 71 on a focal plane side from the shutter unit 72.

The lens carrier 66 includes a lens holder 66 a of a ring shape and aninsertion ring 66 b for insertion of the guide rod 70. The lens holder66 a holds the second lens/lens group G2. Projecting supports 73 and 74with a guide recess are formed on the lens holder 66 a to project at aninterval equal to a diameter of the guide rod 71. The guide rod 71 issupported between the projecting supports 73 and 74, which prevents thelens carrier 66 from offsetting during movement.

A containing chamber 75 is formed in the insertion ring 66 b. Aninsertion ring 68 a of the movement transmitting panel 68 and acompression coil spring 76 are contained in the containing chamber 75.The compression coil spring 76 cooperates with the insertion ring 68 a,and keeps the movement transmitting panel 68 in contact with an upperface of the containing chamber 75. Pivotal holes 77 and 78 as guiderecesses are formed in the insertion ring 66 b, and receive insertion ofthe guide rod 70. A detection arm 79 is formed on the insertion ring 66b, and detected by the photo interrupter 55 for recognizing a positionof the lens carrier 66.

The lens carrier 67 includes a lens holder 67 a and an insertion ring 67b for insertion of the guide rod 70. The lens holder 67 a is cylindricaland holds the fourth lens group G4. Projecting supports 80 and 81 with aguide recess are formed with the lens holder 67 a, and disposed at aninterval equal to a diameter of the guide rod 71. The guide rod 71 isinserted in a space between the projecting supports 80 and 81.

A containing chamber 82 is formed in the insertion ring 67 b. Aninsertion ring 69 a of the movement transmitting panel 69 and acompression coil spring 83 are contained in the containing chamber 82.The compression coil spring 83 cooperates with the insertion ring 69 a,and keeps the movement transmitting panel 69 in contact with an upperface of the containing chamber 82. Pivotal holes 84 and 85 as guiderecesses are formed in the insertion ring 67 b, and receive insertion ofthe guide rod 70. A detection arm 86 is formed on the insertion ring 67b, and detected by the photo interrupter 56 for recognizing a positionof the lens carrier 67.

The movement transmitting panel 68 has a shape of a letter F. Theinsertion ring 68 a is at one end of the movement transmitting panel 68for insertion of the guide rod 70. A hole 87 is formed in the middle ofthe insertion ring 68 a, and receives the guide rod 70. Projectingsupports 68 b and 68 c are formed on a remaining end of the movementtransmitting panel 68, and are positioned at a predetermined interval.Threaded walls 68 d and 68 e of the projecting supports 68 b and 68 chave racks or female thread. A shifting screw of an output shaft 45 b ishelically coupled with the racks or female thread.

The movement transmitting panel 69 has a shape of a letter F. Theinsertion ring 69 a is at one end of the movement transmitting panel 69for insertion of the guide rod 70. The hole 87 is formed in the middleof the insertion ring 69 a, and receives the guide rod 70. Projectingsupports 69 b and 69 c are formed on a remaining end of the movementtransmitting panel 69, and are positioned at a predetermined interval.Threaded walls 69 d and 69 e of the projecting supports 69 b and 69 chave racks or female thread. A shifting screw of an output shaft 46 b ishelically coupled with the racks or female thread.

The guide rods 70 and 71 are inserted through the shutter unit 72. Thelens carrier 66 is moved to pass upper ends of the guide rods 70 and 71for assembly. The lens carrier 67 is moved to pass lower ends of theguide rods 70 and 71 for assembly. The guide rods 70 and 71 guide thelens carriers 66 and 67 to move in the direction of the optical axis L2.

In the shutter unit 72, two shutter blades 90 and 91 are combined withthe shutter motor 92 and a rotating mechanism (not shown) on a driveshaft of the shutter motor 92. When the shutter motor 92 in the shutterunit 72 is supplied with energy, the rotating mechanism rotates to movethe shutter blades 90 and 91 in directions reverse to one another. Anopen area of the exposure opening of the shutter blades 90 and 91changes to change an aperture stop. When the shutter button 15 isdepressed for an exposure, the exposure opening defined by the shutterblades 90 and 91 becomes shut at one time, to intercept object lighttraveling to the CCD 28. Electric charge is obtained in the CCD 28 byphotoelectric conversion, so as to send a sensor output to a controlcircuit board (not shown). The third lens group G3 is held by the lensholder 93. The position adjusting arms or levers 93 a and 93 b areincluded in the lens holder 93 and disposed in a symmetrical manner. Theposition adjusting arms 93 a and 93 b protrude externally from theopening 32 g of the front lid 32 and the opening 60 of the body 31 ofthe lens housing 33. The position adjusting arms 93 a and 93 b areshifted for adjusting the position, and then broken away.

The operation of the construction is described now. The lens assembly orlens mount 29 is produced as follows. In FIG. 6, the zoom motor 45 setin the bracket 47 are assembled in the body 31 of the lens housing 33 atfirst. The first terminal 45 a of the zoom motor 45 is inserted throughthe through hole 51 formed in the body 31, before the bracket 47 isfastened on the body 31 by the screws 49. Similarly, the second terminal46 a of the focusing motor 46 is inserted through the through hole 52formed in the body 31, before the bracket 48 is fastened on the body 31by the screws 49. The second terminal 46 a of the focusing motor 46 iskept oriented to protruded in a direction opposite from that of thefirst terminal 45 a of the zoom motor 45.

In FIG. 7, the photo interrupters 55 and 56 are secured to the body 31after assembling the zooming and focusing motors 45 and 46. The contacts55 a-55 d are inserted through respectively the holes 57 a-57 d beforethe photo interrupter 55 is attached to the body 31 by adhesion andfixed. For the photo interrupter 56, the attachment of the photointerrupter 55 is repeated.

The assembly of the lens moving mechanism 65 is described now. At firstthe guide rods 70 and 71 are assembled with the shutter unit 72. Thelens carrier 66 with the second lens/lens group G2 is set by moving pastthe upper ends of the guide rods 70 and 71. The lens carrier 67 with thefourth lens group G4 is set by moving past the lower ends of the guiderods 70 and 71. The guide rod 70 is inserted in the pivotal holes 77 and78 while the containing chamber 75 of the insertion ring 66 b of thelens carrier 66 contains the insertion ring 68 a of the movementtransmitting panel 68 and the compression coil spring 76. The movementtransmitting panel 68 is kept in contact with an upper face of thecontaining chamber 75 by the bias of the compression coil spring 76.This operation is the same for the lens carrier 66. The lens holder 93holding the third lens group G3 is set on the shutter unit 72, to obtainthe lens moving mechanism 65.

In FIG. 5, the lens moving mechanism 65 is contained in the body 31 ofthe lens housing 33 where the zooming and focusing motors 45 and 46 andthe photo interrupters 55 and 56 have been mounted. An end of theshutter unit 72 on the left side in FIG. 5 is inserted in the railchannel 41 of the body 31. An end of the shutter unit 72 on the rightside in FIG. 5 is inserted in the rail channel 42 of the body 31. Theshutter unit 72 is pressed into the body 31. An upper end of the guiderod 70 is inserted in the guide channel 36, a lower end of the guide rod70 being inserted in the guide channel 39. At the same time, an upperend of the guide rod 71 is inserted in the guide channel 37, a lower endof the guide rod 71 being inserted in the guide channel 40. The thirdterminal 92 a of the shutter motor 92 of the shutter unit 72 becomesinserted in the through hole 53 in the body 31 as the lens movingmechanism 65 is disposed in the body 31. The output shaft 45 b of thezoom motor 45 is inserted between the projecting supports 68 b and 68 cof the movement transmitting panel 68. The output shaft 45 b is meshedwith the racks of the threaded walls 68 d and 68 e. Similarly, theoutput shaft 46 b of the focusing motor 46 is inserted between theprojecting supports 69 b and 69 c of the movement transmitting panel 69.The screw of the output shaft 46 b is meshed with the racks of thethreaded walls 69 d and 69 e.

The front lid 32 is fastened on the body 31 of the lens housing 33 onthe front side by use of the screws 61 and other elements. The positionadjusting arm or lever 93 a of the lens holder 93 becomes protruded fromthe opening 32 g of the front lid 32. The position adjusting arm orlever 93 b of the lens holder 93 becomes protruded from the opening 60of the body 31. After this, the third lens group G3 is adjusted for theposition by use of the position adjusting arms or levers 93 a and 93 b,which are then torn away. Note that the openings 32 g and 60 are coveredby a lid (not shown). The lens assembly or lens mount 29 is obtainedfinally.

In FIGS. 9, 10 and 11, the lens moving mechanism 65 becomes contained inthe body 31 of the lens housing 33. The zoom motor 45 is kept retainedbetween the guide rod 70 and the inner surface 31 d of the body 31 andnear to an upper face of the shutter unit 72. The focusing motor 46 iskept retained between the guide rod 70 and the containing chamber 31 band near to a lower face of the shutter unit 72. The shutter motor 92 iscontained in the containing chamber 31 b, so the focusing motor 46 isdisposed near to the shutter motor 92 of the shutter unit 72. Therefore,the zoom motor 45, the focusing motor 46 and the shutter motor 92 arelocated near to one another. Note that the zooming and focusing motors45 and 46 are protruded to the outside of the body 31 through thethrough holes 51 and 52 in the inner surface 31 j of the body 31. Theshutter motor 92 is also protruded to the outside of the body 31 throughthe through hole 53. Thus, the terminals of those can be positioned in anearly coplanar form.

The photo interrupters 55 and 56 are disposed between the inner surface31 j of the body 31 of the lens housing 33 and the guide rod 70. Thecontacts 55 a-55 d are inserted through the holes 57 a-57 d to protrudeto the outside of the body 31. The contacts 56 a-56 d are insertedthrough the holes 58 a-58 d to protrude to the outside of the body 31.So those contacts are positioned coplanarly. The detection arm 79 isformed with the insertion ring 66 b of the lens carrier 66, thedetection arm 86 being formed with the insertion ring 67 b of the lenscarrier 67. As the photo interrupter 55 is near to the zoom motor 45 andthe photo interrupter 56 is near to the focusing motor 46, contacts ofthe photo interrupters can be positioned near to terminals of themotors.

In FIG. 12, a circuit board or flexible wiring board 100 is connectedwith the lens assembly or lens mount 29 for driving and controlling thezoom motor 45, the focusing motor 46 and the shutter motor 92. The firstand second terminals 45 a and 46 a and the third terminal 92 a of thezoom motor 45, the focusing motor 46 and the shutter motor 92 areattached by soldering for connection with lines of the circuit board 100in the rear of the lens assembly or lens mount 29. Also, the contacts 55a-55 d and the contacts 56 a-56 d of the photo interrupters 55 and 56protrude from the rear of the body 31 of the lens housing 33, and areattached by soldering for connection with the circuit board 100. It ispossible for the circuit board 100 to have a relatively small areabecause of the vicinity in the arrangement of the first and secondterminals 45 a and 46 a and the third terminal 92 a, the contacts 55a-55 d and the contacts 56 a-56 d. A circuit structure of the circuitboard 100 can be simplified.

Unlike the above lens assembly in the box shape, a lens assembly of theinvention may be a lens barrel of a cylindrical shape. In FIG. 13, alens housing 105 of the lens assembly has an inner surface 105 a. Ashutter motor or actuator 101, a zoom motor or actuator 102, a focusingmotor or actuator 103, and a position sensor 104 are arranged on theinner surface 105 a. Terminals and contacts protrude through the wall ofthe lens housing 105, including a terminal 101 a of the shutter motor oractuator 101, a first terminal 102 a of the zoom motor or actuator 102,a second terminal 103 a of the focusing motor or actuator 103, andcontacts 104 a and 104 b of the position sensor 104. The positions ofthe terminals and contacts are defined on an outer surface 105 b of thelens housing 105. This is effective in simply constructing the flexiblewiring board for connection of those. An area of the wiring board can besmall.

In FIG. 14, another preferred lens assembly or lens mount 113 of adigital still camera is illustrated. The lens assembly or lens mount 113includes a prism containing chamber 121, a lens housing 122 with a body,and a front lid 123. Screws 124 are used for securing the front lid 123on the lens housing 122. The prism containing chamber 121 is disposedhigher in the lens housing 122. The prism containing chamber 121 is in aform of a triangular frame. A prism (not shown) is contained in theprism containing chamber 121, has a triangular form when viewed in across section, and operates to change a light path from the firstoptical axis Li to the second optical axis L2 by bending. A first lenscarrier 126 with a lens holder is secured to a front face of the prismcontaining chamber 121. A first lens/lens group 125 is held in the firstlens carrier 126. One other lens/lens group (not shown) is disposedunder the prism containing chamber 121.

In FIG. 15, the lens housing 122 has a shape in combination of a box anda projection disposed laterally on the box. A front opening 127 is openin the lens housing 122. The lens housing 122 has first guide channels128 a and 128 b, second guide channels 129 a and 129 b, and a shutterconnector 130 as second support portion. Screw holes 131 are formed inthe lens housing 122 for securing the front lid 123. Lens movingmechanisms 132 and 133 and a CCD image sensor 134 are incorporated inthe lens housing 122. The lens housing 122 has such a size as to containa combined component easily, the component including a second lenscarrier 135, a third lens carrier 136, a shutter unit 137, a fourth lenscarrier 138, and guide rods 139 a and 139 b.

A lower surface 122 a of the inside of the lens housing 122 has thefirst guide channels 128 a and 128 b formed therein. A higher portion isformed to protrude from the lower surface 122 a in a stepped form.Contact surfaces 128 c and 128 d as first support portion are includedin the higher portion as well as the first guide channels 128 a and 128b and a space for supporting the CCD 134.

A size of the first guide channels 128 a and 128 b is such that nolooseness occurs with the guide rods 139 a and 139 b when the firstguide channels 128 a and 128 b receive insertion of the guide rods 139 aand 139 b. The contact surfaces 128 c and 128 d are formed at the innerends of the first guide channels 128 a and 128 b, for contact with rodfaces of the guide rods 139 a and 139 b. The contact surfaces 128 c and128 d extend in shapes of arcs substantially equal to an arc of theguide rods 139 a and 139 b. The first guide channels 128 a and 128 b andthe contact surfaces 128 c and 128 d, when viewed downwards from theupside, are formed in an U shape from the front opening 127 of the lenshousing 122 toward the inside. The first guide channels 128 a and 128 bare so formed that an optical axis of a second lens/lens group 161 andthe second optical axis L2 coincide with one another when the guide rods139 a and 139 b are inserted deeply.

The inside of the lens housing 122 has an upper surface 122 b. Thesecond guide channels 129 a and 129 b and second contact surfaces 129 cand 129 d as first support portion are positioned on the upper surface122 b and directly higher than the first guide channels 128 a and 128 band the contact surfaces 128 c and 128 d. In FIG. 15, the second guidechannels 129 a and 129 b and the second contact surfaces 129 c and 129 dare positioned at the ends of the prism containing chamber 121. Thesizes of the second guide channels 129 a and 129 b are such that, evenwhen the guide rods 139 a and 139 b are inserted, no looseness occurs onthe guide rods 139 a and 139 b. The second contact surfaces 129 c and129 d are defined to extend inwards from the second guide channels 129 aand 129 b, and come to contact upper end faces of the guide rods 139 aand 139 b. The second contact surfaces 129 c and 129 d are formed in ashape of an arc approximately equal to an arc of the rod face of theguide rods 139 a and 139 b. The second guide channels 129 a and 129 band the second contact surfaces 129 c and 129 d, when viewed upwardsfrom the downside, are in the U shape from the front opening 127 of thelens housing 122 toward the inside. Also the second contact surfaces 129c and 129 d are so predetermined for the position that the optical axisof the second lens/lens group 161 coincides with the optical axis L2upon insertion of the guide rods 139 a and 139 b.

The shutter connector 130 is associated with inner lateral surfaces 122c and 122 d of the lens housing 122, and positions the shutter unit 137relative to the direction of the second optical axis L2. Rail ridges 130a and 130 b in the shutter connector 130 protrude from the inner lateralsurfaces 122 c and 122 d toward the inside of the lens housing 122. Whena base panel 137 a of the shutter unit 137 is inserted to place theshutter unit 137 in the lens housing 122, the shape of the rail ridges130 a and 130 b prevents excessive looseness. The rail ridges 130 a and130 b are positioned with a sufficient interval.

The lens moving mechanism 132 is disposed on the left upper portion ofthe lens housing 122, and is constituted by a first bracket 151 and afirst motor or actuator 152. The first bracket 151 is produced from theplate and obtained by bending the plate in a channel shape. Projectingpanels are formed to protrude from upper and lower ends. Insertion holesare formed in the first bracket 151. A first shifting screw 153 isinserted in the insertion holes. The first motor 152 has the firstshifting screw 153. A panel 151 a for support is disposed higher thanthe first motor 152. The first shifting screw 153 of the first motor 152protrudes from the panel 151 a toward an upper protrusion (not shown) .A screw thread is provided on the first shifting screw 153, and iscaused to rotate when the first motor 152 rotates.

The lens moving mechanism 133 is disposed on the left lower portion ofthe lens housing 122, and is constituted by a second bracket 155 and asecond motor or actuator 156. The second bracket 155 is produced fromthe plate and obtained by bending the plate in a channel shape. Panels155 a and 155 b for support are formed to protrude from upper and lowerends. Insertion holes are formed in the panels 155 a and 155 b. A secondshifting screw 157 is inserted in the insertion holes. The second motor156 has the second shifting screw 157. The panel 155 a for support isdisposed lower than the second motor 156. The second shifting screw 157of the second motor 156 protrudes from the panel 155 a toward the panel155 b. A screw thread is provided on the second shifting screw 157, andis caused to rotate when the second motor 156 rotates.

In FIG. 16, the second lens carrier 135 includes a second lens holder135 a in a lens carrier, rod holes 135 b and 135 c, and a panel 135 dfor support. The second lens holder 135 a holds the second lens/lensgroup 161. The rod holes 135 b and 135 c receive insertion of the guiderods 139 a and 139 b. The panel 135 d is coupled with the first shiftingscrew 153. The second lens holder 135 a has a ring shape. The secondlens/lens group 161 is secured to an upper portion of the second lensholder 135 a. The rod holes 135 b and 135 c are open in portions of thesecond lens holder 135 a. The sizes of the rod holes 135 b and 135 c aresuch that, even when the guide rods 139 a and 139 b are inserted, nolooseness occurs with the second lens carrier 135. A female thread 135 eis formed in the hole of the panel 135 d, for receiving insertion of thefirst shifting screw 153 when the second lens carrier 135 is containedin the lens housing 122. The female thread 135 e meshed with the firstshifting screw 153 helically converts rotation of the first shiftingscrew 153 into linear movement of the second lens carrier 135 in thedirection of the second optical axis L2.

The third lens carrier 136 is disposed higher than the shutter unit 137.A third lens/lens group 162 is held in the middle of the third lenscarrier 136. Screw holes (not shown) are formed in the third lenscarrier 136 for fastening on the shutter unit 137. The third lenscarrier 136 is kept fixed by screws.

A shutter actuator or motor 137 b is included in the shutter unit 137 aswell as the base panel 137 a and a shutter blade (not shown). The thirdlens carrier 136 is secured to an upper portion of the base panel 137 a.The shutter actuator or motor 137 b is secured to a lower portion of thebase panel 137 a. Rod holes 137 c and 137 d are formed in the base panel137 a for insertion of the guide rods 139 a and 139 b. The rod holes 137c and 137 d have a size enough for inserting the guide rods 139 a and139 b with sufficient play.

The fourth lens carrier 138 includes a fourth lens holder 138 a in alens carrier, rod holes 138 b and 138 c, and a panel 138 d for support.A fourth lens/lens group 163 is held by the fourth lens holder 138 a.The rod holes 138 b and 138 c receive insertion of the guide rods 139 aand 139 b. The panel 138 d is coupled with the second shifting screw157. The fourth lens holder 138 a is shaped cylindrically, and providedwith the fourth lens/lens group 163 mounted therein. The rod holes 138 band 138 c are open in portions of the fourth lens holder 138 a. Theguide rods 139 a and 139 b are insertable in the rod holes 138 b and 138c, and have such a size that no looseness occurs with the fourth lenscarrier 138 upon insertion. A screw hole with a female thread 138 e isformed with the panel 138 d, and helically engaged with the secondshifting screw 157 when the fourth lens carrier 138 is inserted in thelens housing 122. The female thread 138 e meshed with the secondshifting screw 157 converts rotation of the second shifting screw 157 tomovement of the fourth lens carrier 138 in the direction of the secondoptical axis L2.

The guide rods 139 a and 139 b are shaped for insertion in the rod holes135 b and 135 c, the rod holes 137 c and 137 d and the rod holes 138 band 138 c, and insertion in the first guide channels 128 a and 128 b andthe second guide channels 129 a and 129 b when contained in the lenshousing 122. A length of the guide rods 139 a and 139 b are such as tobe guided by the first guide channels 128 a and 128 b and the secondguide channels 129 a and 129 b when contained in the lens housing 122.

In FIG. 17, the front lid 123 is constituted by a panel from which aprojection protrudes laterally. Six through holes 123 a are formedthrough the front lid 123 for inserting the screws 124 to fastening onthe lens housing 122. Regulators 165 a and 165 b are formed with therear of the front lid 123. When the front lid 123 is fitted on the lenshousing 122, the regulators 165 a and 165 b are inserted in the firstguide channels 128 a and 128 b, and press the guide rods 139 a and 139 bfrom the side of the front opening 127 of the lens housing 122 forfixation and limiting their movement. Also, regulating projections 166 aand 166 b are formed higher and with the rear of the front lid 123. Whenthe front lid 123 is fitted on the lens housing 122, the regulatingprojections 166 a and 166 b are inserted in the second guide channels129 a and 129 b, and press the guide rods 139 a and 139 b from the sideof the front opening 127 of the lens housing 122 for fixation andlimiting their movement.

The method of assembling the lens assembly or lens mount 113 isdescribed now. To assemble parts of the lens assembly or lens mount 113,the guide rods 139 a and 139 b are inserted in holes of the shutter unit137. The second lens carrier 135 is moved downward to the shutter unit137 for insertion. The fourth lens carrier 138 is moved upward to theshutter unit 137 for insertion. Thus, the second lens carrier 135 andthe fourth lens carrier 138 are assembled.

Then the base panel 137 a of the shutter unit 137 is inserted in theshutter connector 130. The guide rod 139 a is guided by the contact ofits upper end with the first guide channel 128 a and its lower end withthe second guide channel 129 a. The guide rod 139 b is guided by thecontact of its upper end with the first guide channel 128 b and itslower end with the second guide channel 129 b. The guide rod 139 a comesin contact with the contact surfaces 128 c and 129 c. The guide rod 139b comes in contact with the contact surfaces 128 d and 129 d. Thus, thesecond optical axis L2 can be caused to coincide with the optical axisof the second, third and fourth lenses/lens groups 161-163 by contact ofthe guide rods 139 a and 139 b with the contact surfaces 128 c and 128 dand the second contact surfaces 129 c and 129 d. After the movement ofthe guide rods 139 a and 139 b, the female thread 135 e in the panel 135d receives the first shifting screw 153 for helical coupling. The femalethread 138 e in the panel 138 d receives the second shifting screw 157for helical coupling. When the first shifting screw 153 is caused torotate by rotation of the first motor 152, the female thread 135 emeshed with the first shifting screw 153 moves the second lens carrier135 in the direction of the second optical axis L2. When the secondshifting screw 157 is caused to rotate by rotation of the second motor156, the female thread 138 e meshed with the second shifting screw 157moves the fourth lens carrier 138 in the direction of the second opticalaxis L2.

After the second lens carrier 135 is inserted in the lens housing 122,the front lid 123 is fitted to close the front opening 127 of the lenshousing 122. In FIGS. 18 and 18A, the regulators 165 a and 165 b of thefront lid 123 are inserted in the first guide channels 128 a and 128 b.The regulating projections 166 a and 166 b are inserted in the secondguide channels 129 a and 129 b. Ends of the regulators 165 a and 166 acome to contact a rod face of the guide rod 139 a. Ends of theregulators 165 b and 166 b come to contact a rod face of the guide rod139 b. As the screws 124 are fastened to secure the front lid 123, theregulators 165 a and 166 a keep the guide rod 139 a pressed from thefront of the lens housing 122. The regulators 165 b and 166 b keep theguide rod 139 b pressed similarly. Thus, the second lens carrier 135 isfirmly positioned inside the lens housing 122 by preventing the guiderods 139 a and 139 b from offsetting.

Accordingly, the second, third and fourth lenses/lens groups 161-163 andthe shutter unit 137 can be positioned only by inserting the lens holderwith the guide rods 139 a and 139 b through the front of the lenshousing 122, because of the positioning with the first and secondcontact surfaces. The positioning of the second, third and fourthlenses/lens groups 161-163 and the shutter unit 137 is considerably easybecause of the insertion into the lens housing 122 through the frontopening in the direction vertical to the second optical axis. It ispossible to automate containing operation of the second, third andfourth lenses/lens groups 161-163 and the shutter unit 137 into the lenshousing 122, to raise efficiency and enable mass production of the lensassembly or lens mount 113 by utilizing machines in a producing line.Also, the guide rods 139 a and 139 b become inserted while guided by thefirst guide channels 128 a and 128 b and the second guide channels 129 aand 129 b. Damage of the lens housing 122 due to striking of the guiderods 139 a and 139 b inside the lens housing 122 can be prevented.

It is possible in the invention to determine the size of the first guidechannels 128 a and 128 b and the second guide channels 129 a and 129 bdifferently in the manner of FIGS. 18 and 18A. In FIG. 19, one preferredembodiment is illustrated. A guide channel 171 has a V shape as viewedin section. A guide rod 172 has a diameter D1 which is smaller than awidth of the width H1 of a front portion of the guide channel 171 of thelens housing 122. This is effective in facilitating insertion of theguide rod 172 in the guide channel 171. Note that a regulatingprojection 173 may has any suitable shape as viewed in section, forexample a rectangular quadrilateral shape or V shape similar to that ofthe guide channel 171, in view of preventing creation of play with theguide rod 172 when the front lid 123 is fastened with screws.

In FIG. 20, one preferred combination of a contact surface 181 and aguide rod 182 is illustrated. Let H2 be a width of the contact surface181. Let D2 be a diameter of the guide rod 182. The contact surface 181and the guide rod 182 are shaped to satisfy a condition of D2<H2. Theshaping of the contact surface 181 is effective in keeping sufficientdegree of freedom in adjusting the position of the guide rod 182. Shoulda difference occur incidentally between the optical axis L2 and anyoptical axis of the second, third and fourth lenses/lens groups, thedifference can be minimized by adjustment. Note that adhesive agent 185can be applied to surfaces of a space between the guide rod 182 and thecontact surface 181 after completing the adjustment. A regulatingprojection 183 projecting from the front lid 123 can fix the guide rod182. It is possible to shape the regulating projection 183 in any formif no looseness occurs with the guide rod 182 when the lid is fastenedwith screw.

In FIG. 21, another preferred lens assembly or lens mount 210 isillustrated. A lens housing 211 of the lens assembly or lens mount 210contains a lens moving mechanism, CCD image sensor and the like, and canbe handled in a unified manner. An image pickup optical system 212includes path changing optics 213, an aperture stop adjusting shuttermechanism 214, and a lens moving device 215 as lens moving mechanism.

The path changing optics 213 include a first lens/lens group 216, aprism 217, and second, third, fourth and fifth lenses/lens groups 218,219, 220 and 221 arranged in a sequence from the object side. Theaperture stop adjusting shutter mechanism 214 is disposed between thefourth and fifth lenses/lens groups 220 and 221. A first optical axis222 passes through the center of the first lens/lens group 216. Theprism 217 perpendicularly reflects object light having traveled on thefirst optical axis 222. A second optical axis 223 is defined to passthrough the second, third, fourth and fifth lenses/lens groups 218-221,and is perpendicular to the first optical axis 222. The prism 217directs the object light along the second optical axis 223. A CCD imagesensor 224 has a receiving surface on which object light reflected bythe prism 217 is focused. The CCD 224 is stationary behind the fifthlens/lens group 221 in relation to the direction of the second opticalaxis 223. An object image is converted into an image signal. Note thatthe first optical axis 222 is depicted in the shape bent toward the leftfor the simplicity of depiction, but is actually bent in the directionvertical to the drawing sheet of FIG. 21.

In the path changing optics 213, the first lens/lens group 216, thesecond lens/lens group 218 and the fourth lens/lens group 220 arestationary. The third and fifth lenses/lens groups 219 and 221 aremovable in the direction of the second optical axis 223. A third lenscarrier 225 holds the third lens/lens group 219. A sleeve 228 and a ring229 for support are formed with the third lens carrier 225. Guide rods226 and 227 are inserted in the sleeve 228 and the ring 229. The sleeve228 and the ring 229 are guided for movement by the guide rods 226 and227 which extend in parallel with the second optical axis 223. The guiderods 226 and 227 are arranged so that the second optical axis 223 liesbetween those. Upper and lower panels 211 a and 211 b of the lenshousing 211 keep the guide rods 226 and 227 positioned at their ends.

A panel 231 for support is formed with the sleeve 228 and the ring 229.A screw hole with a female thread 230 is formed in the panel 231. Ashifting screw 232 is helically coupled with the female thread 230. Afirst motor or actuator 233 has an output shaft in connection with theshifting screw 232, and rotates to move the third lens/lens group 219.When the first motor 233 is driven, the third lens/lens group 219 movesin the direction of the second optical axis 223.

A fifth lens carrier 235 holds the fifth lens/lens group 221. A ring 236and a sleeve 237 for support are portions of the fifth lens carrier 235.In the fifth lens carrier 235, a panel 239 for support has a femalethread 238. A shifting screw 241 is an output shaft of a second motor oractuator 240. The shifting screw 241 is helically coupled with thefemale thread 238, so that rotation of the second motor 240 causes thefifth lens carrier 235 to move in the direction of the second opticalaxis 223. Note that a focal length of the image pickup optical system212 varies by moving the third and fifth lenses/lens groups 219 and 221.Focusing of the image pickup optical system 212 is adjusted by movingthe fifth lens/lens group 221.

In FIGS. 22 and 23, the aperture stop adjusting shutter mechanism 214 isa unit or composite part, and includes a base panel 245 or shutterpanel, a driving lever 246, a motor or actuator 247, a pair of shutterblades or interception blades 248 and 249, and a fourth lens carrier 250with a lens holder. The base panel 245 extends longitudinally in onedirection crosswise to the second optical axis 223. The base panel 245includes a base surface 252, a fastening block with a fastening surface253, a recess 254, a shutter opening 255 as light path opening, and apair of rod holes 256 and 257.

The base surface 252 is contacted by the shutter blade 248 to move. Thefastening block 253 is positioned on the second optical axis 223. Therod holes 256 and 257 are formed in the fastening block 253, and receiveinsertion of the guide rods 226 and 227. The rod hole 257 of those is apositioning hole for contact with the guide rod 226. The rod hole 256 isin a form of stopping the base panel 245 in a rotational manner. Thus,the base panel 245 is positioned by the guide rods 226 and 227 in afirst direction D and a second direction perpendicular to the firstdirection. Note that the lens housing 211 causes the base panel 245 tobe positioned in the height direction. The recess 254 is formed on anend of the base surface 252 farther from the second optical axis 223,and is a space for containing the driving lever 246 in a rotatablemanner. The shutter opening 255 is disposed on the second optical axis223, and causes object light to pass behind the shutter blades 248 and249.

The fastening block 253 has a shape of protruding a support of arectangular form in the direction along the second optical axis 223higher than the shutter opening 255 as viewed in a plan toward thefront. There are lateral surfaces 260 and 261 of the fastening block253. Insertion slots or rail slots 262 and 263 are formed in the lateralsurfaces 260 and 261 for insertion of the shutter blades 248 and 249 inan overlapped manner. A tunnel or rail portion 264 interconnects theinsertion slots 262 and 263. The shutter blades 248 and 249 are keptmovable by the insertion slots 262 and 263 in relation to a singledirection on the base surface 252. Edges 262 a and 263 a of theinsertion slots 262 and 263 have a level lower than the tunnel or railportion 264. A size between the base surface 252 and the edges 262 a and263 a is equal to or slightly more than a thickness of the shutterblades 248 and 249. Friction between the shutter blades 248 and 249 isreduced. Also, friction between the shutter blade 248 or 249 and thebase surface 252 or the edges 262 a and 263 a is reduced.

The driving lever 246 rotationally shifts between a shut position and anopen position, and when in the shut position, causes the actuator 247 toshut the shutter opening 255, and when in the open position, opens theshutter opening 255. A pair of cam pins 278 and 279 are formed with thedriving lever 246. The cam pins 278 and 279 extend toward the shutterblades 248 and 249 from both sides beside the rotational axis. Theactuator 247 is secured to the rear of the base panel 245. An outputshaft of the actuator 247 comes through toward the base surface 252. Thedriving lever 246 is secured to an end of the output shaft. Note thatdisposition of the actuator 247 and the driving lever 246 may beopposite to that of the present embodiment as viewed with reference tothe base panel 245. This is effective in preventing drop of the shutterblades 248 and 249 and preventing deformation of the shutter blades 248and 249.

Various openings are formed in the shutter blades 248 and 249, andinclude first and second aperture stop openings 270 and 271, slots 272,273, 274 and 275, and cam follower grooves 276 and 277. The slots272-275 receive insertion of the guide rods 226 and 227, and also areengaged with the guide rods 226 and 227 to guide the shutter blades 248and 249 to move in the predetermined direction. The cam pins 278 and 279are engaged with edges of the cam follower grooves 276 and 277.

In FIG. 24, when the driving lever 246 rotationally shifts to the shutposition, the shutter blade 248 is slid in the direction to the left.The shutter blade 249 is slid in the direction to the right. No opennessis created by overlapping of the first and second aperture stop openings270 and 271 at the shutter opening 255. Thus, the shutter opening 255 isshut. In FIG. 25, when the driving lever 246 rotationally shifts to theopen position, the shutter blade 248 is slid in the direction to theright. The shutter blade 249 is slid in the direction to the left. Thefirst and second aperture stop openings 270 and 271 come to meet eachother by superposition on the shutter opening 255, which becomes openfully.

In FIG. 26, portions of the first and second aperture stop openings 270and 271 become overlapped on the shutter opening 255 upon reach of thedriving lever 246 to one position between the shut and open positions.The first and second aperture stop openings 270 and 271 determine anaperture stop opening of a smaller diameter than that of the shutteropening 255. The first and second aperture stop openings 270 and 271 areoriginally in a symmetrical form for the purpose of providing a nearlycircular shape in the aperture stop opening as a circle about the secondoptical axis 223.

In FIG. 27, a lens holder 300 is combined with the fourth lens/lensgroup 220 to constitute the fourth lens carrier 250. The lens holder 300includes a holder ring 310 and arms 301 and 302. The holder ring 310holds the fourth lens/lens group 220. The arms 301 and 302 protrude fromthe holder ring 310 in a direction perpendicular to the one direction D.The lens holder 300 is a single piece of resin formed by molding. Thearms 301 and 302 have resiliency, and operate to apply pressure in thecourse of adjusting eccentricity.

A support block 290 is formed with the fastening block 253 forsupporting the fourth lens carrier 250. The support block 290 includes areceiving surface 292, a connection ridge 303, and an aperture 304. Thereceiving surface 292 contacts and receives the fourth lens carrier 250.The aperture 304 passes object light. The connection ridge 303 protrudesat one step and extends about the holder ring 310. Recessed portions 298and 299 are formed to cause the arms 301 and 302 to move away.

To secure the fourth lens carrier 250 to the support block 290, at firstthe fourth lens carrier 250 is inserted downward to the receivingsurface 292. The arms 301 and 302 are pressed downwards to adjust theeccentricity. When the position of the fourth lens/lens group 220 isdetermined, adhesive agent is applied to adhesion positions 324, 325 and326 between the connection ridge 303 and the lens assembly or lens mount210. See FIG. 28. The fourth lens/lens group 220 is attached by theadhesion. The number of the adhesion positions may be varied, but can bepreferably three or so. After the attachment, the arms 301 and 302 arecut away at lines indicated by cut positions 320 and 321.

In the present embodiment, the slots 272-275 are guide holes for slidingof the shutter blades 248 and 249. However, the slots 272-275 may beholes not contacting the guide rods 226 and 227 for the same purpose.For example, a structure for guiding can be associated with any one ofthe base panel 245 and the shutter blades 248 and 249 for causing slideof the shutter blades 248 and 249.

In the above embodiment, a shutter mechanism is the aperture stopadjusting shutter mechanism 214. However, a mechanism of the inventionmay be an aperture stop mechanism, or a shutter mechanism, or a lightintercepting mechanism only for intercepting object light in front of animage pickup sensor.

In the above embodiment, the optical path is changed with a bend.However, an optical path of an optical system of the invention may bestraight without a bend. In the above embodiment, both of the third andfifth lenses/lens groups 219 and 221 are movable. However, only one ofthe third and fifth lenses/lens groups 219 and 221 beside the aperturestop adjusting shutter mechanism 214 may be movable.

In the above embodiment, the prism is used for changing the optical pathby reflection. However, a mirror can be used for the purpose of changingthe optical path instead of the prism. Furthermore, the optical pathchanging optics may not be used. The optical path may be single andlinear without path changing optics. The camera of the embodiment is thedigital still camera. However, a camera of the invention may be a camerafor use with silver halide photographic film. Also, a lens moving deviceof the invention may be used in any suitable optical instrument, such asa projector.

Although the present invention has been fully described by way of thepreferred embodiments thereof with reference to the accompanyingdrawings, various changes and modifications will be apparent to thosehaving skill in this field. Therefore, unless otherwise these changesand modifications depart from the scope of the present invention, theyshould be construed as included therein.

1. A lens assembly, having first and second lenses, being movable,contained in a lens housing, and supported in respectively first andsecond lens holders, and a guide rod for guiding movement of said firstand second lenses in an optical axis direction with said first andsecond lens holders, said lens assembly comprising: a shutter unitdisposed between said first and second lens holders; a shutter actuatorfor driving said shutter unit; a containing chamber in said lens housingfor containing said shutter actuator; a first actuator, disposed betweensaid guide rod and an inner surface of said lens housing and near to afirst surface of said shutter unit, for moving said first lens holder;and a second actuator, disposed between said guide rod and saidcontaining chamber and near to a second surface of said shutter unit,for moving said second lens holder.
 2. A lens assembly as defined inclaim 1, further comprising a guide recess, formed in each of said firstand second lens holders, for receiving insertion of said guide rod in aslidable manner.
 3. A lens assembly as defined in claim 2, wherein saidlens housing includes: a first inner surface, disposed to extendsubstantially in parallel with said optical axis direction, and havingone portion where said containing chamber is located; a second innersurface, disposed to extend substantially in parallel with said opticalaxis direction, and crosswise to said first inner surface; and throughholes, formed through said inner surface, for passing terminals of saidfirst and second actuators and a terminal of said shutter actuator, toprotrude externally.
 4. A lens assembly as defined in claim 3, furthercomprising: a detector, disposed between said guide rod and said secondinner surface, for detecting a position of each of said first and secondlens holders; a through hole, formed through said second inner surface,for passing a contact of said detector to protrude externally.
 5. A lensassembly as defined in claim 1, wherein said lens housing has a boxshape.
 6. A lens assembly as defined in claim 1, further comprisingthrough holes, formed through an inner surface of said lens housing, forpassing terminals of said first and second actuators and a terminal ofsaid shutter actuator, to protrude externally.
 7. A lens assembly asdefined in claim 6, further comprising: a detector, disposed betweensaid guide rod and said inner surface, for detecting a position of eachof said first and second lens holders; a through hole, formed throughsaid inner surface, for passing a contact of said detector to protrudeexternally.
 8. A lens assembly as defined in claim 1, wherein said firstand second actuators are motors.